#include <stdio.h> int daynum[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31}; //二月暂以平年记 int IsLeap(int year){ if((year%4 == 0 && year%100 != 0) || year%400 == 0) return 1; return 0; } int WeekDay(int year,int month){ int daycount = 1; //某月第一天 int i; for(i=2007;i<year;i++){ daycount += (IsLeap(i) + 365); // great; } for(i=1;i<month;i++){ daycount += daynum[i]; } if(month > 2) daycount += IsLeap(year); return daycount%7; } void Print_Calendar(int year,int month,int day){ int i,count; printf("Calendar %d - %02d\n",year,month);//%02d printf("---------------------\n"); printf("Su Mo Tu We Th Fr Sa\n"); printf("---------------------\n"); for(i=0;i<day;i++)//输出第一行数字前的空格 printf(" "); //三个空格 for(i=1;i< (7-day);i++) printf("%2d ",i); printf("%2d\n",7-day);//最后一个数字不带空格 if(month == 2 && IsLeap(year)) daynum[month] += 1; count = 0; for(i=7-day+1;i<=daynum[month];i++){ count ++; if(count % 7 == 0) printf("%2d\n",i); else{ if(count == daynum[month]+day-7) //最后一行特别处理 printf("%2d\n"); else{ printf("%2d ",i); } } } printf("---------------------\n"); } int main(){ int year,month,day; scanf("%d%d",&year,&month); day = WeekDay(year,month); Print_Calendar(year,month,day); return 0; }
原文:http://www.cnblogs.com/520xiuge/p/6231249.html